Difference in VHDL

• In VHDL the same statement will mean a feedback in a purely combinational logic which is invalid.



• VHDL code is inherently concurrent (parallel).

• Only statements placed inside a PROCESS, FUNCTION, or PROCEDURE are sequential.

• Concurrent code is also called data flow code.

• Order does not matter.

• We can only build combinational logic circuits with concurrent code.

• Concurrent assignment produces one driver for each assignment statement.



Multiple driver assignment



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